CA2065507C - Reduced pressure heat treating device - Google Patents
Reduced pressure heat treating deviceInfo
- Publication number
- CA2065507C CA2065507C CA002065507A CA2065507A CA2065507C CA 2065507 C CA2065507 C CA 2065507C CA 002065507 A CA002065507 A CA 002065507A CA 2065507 A CA2065507 A CA 2065507A CA 2065507 C CA2065507 C CA 2065507C
- Authority
- CA
- Canada
- Prior art keywords
- heat exchanger
- heat
- reduced pressure
- ejector
- treating device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 230000009467 reduction Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 33
- 230000006872 improvement Effects 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 3
- 239000000498 cooling water Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000011176 pooling Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 208000036366 Sensation of pressure Diseases 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S165/00—Heat exchange
- Y10S165/917—Pressurization and/or degassification
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
A heat treating device for use in chemical and food industries, including a heat exchanger of jacket type, for example, which surrounds a reaction vessel, wherein heat media such as steam and water are fed to the heat exchanger and also sucked by sucking means such as an ejector to put the interior of the heat exchanger in a reduced pressure state, whereby effecting heat treatment at relatively low temperature below 100°C, for example, the improvement of which is to prevent variation of the reduced pressure level in the heat exchanger for keeping stability of treating temperature. The improvement is attained by connecting another sucking means to the upper portion of the heat exchanger to suck vapor in the upper portion of the heat exchanger aside from the first-mentioned ejector which is connec-ted to the lower portion of the heat exchanger.
Description
2 0 6 5 5 07 65259-l4l Background of Invention This invention relates to a heat treating device for safely and efficiently heat-treating product to be treated at relatively low temperature such as below 100C, using reduced pressure steam and/or water as heat media.
Brief Description of the Drawings In the drawings:
Figure 1 is a schematic view showing a configuration of a reduced pressure heat treating device according to the prior art;
Figure 2 is a schematic view showing a configuration of an embodiment of the reduced pressure heat treating device according to this invention;
Figures 3, 4, 5 and 6 are partial views showing variations of the embodiment of Figure 2, respectively; and Figures 7 and 8 are partial views showing further variations of the embodiment of Figure 2.
In the chemical industry and food industry, mater-ials may be treated at relatively low temperature such as about 50C, for example, for the purpose of safety of working and maintenance of product quality. Such a reduced pressure steam heat treating device as disclosed in the Japanese opened patent gazette No. Hl-315336 has been proposed for this heat treatment.
As shown in. Fi~ure 1, this device includes a reaction vessel 1 for causing materials supplied from an inlet 5 to react while stirring them by a stirrer 7 and delivering reaction product from - 2 0 6 5 ~ 0 7 65259-l4l an outlet 9. A heat exchanger 11 of jacket type having an inlet 13 and an outlet 15 of a heat media such as steam and water surrounds the vessel 1. Piping 17 feeds heating steam to the heat exchanger 11 through an automatic valve 19, a suction pump 21 of ejector type having its suction port 23 connected to the outlet 15 of the heat exchanger 11 through piping 24. A water tank 25 has a diffuser 27 of the ejector 21 connected to its upper space and is provided with level sensors 29a and 29b and a temperature sensor 31. Piping 33 feeds cooling water to the water tank 25 through an automatic valve 35, and piping 37 connects a lower portion of the tank 25 to a jetting nozzle 41 of the ejector 21 through a pump 39. Piping 43 connects the piping 37 to the inlet 13 of the h~at exchanger 11 through an automatic valve 45, and drain piping 47 connects the piping 43 to the exterior through an automatic valve 49. A central control unit 51 receives signals from the sensors 29a and 29b and 31 to control the respective automatic valves. When the pump 39 is driven, the water in the tank 25 circulates through the piping 37 and the ejector 21 to maintain the ejector 21 in a sucking state.
When the reaction vessel 1 is heated, the valve 19 is opened and the valve 45 is closed by signals from the central control unit 51, and heating steam is supplied from the piping 17 to the heat exchanger 11. The steam is sucked by the ejector 21 to enter the water tank 25 together with condensed water, thereby raising the water temperature within the tank 25 gradual-ly. Since the interior of the heat exchanger 11 is put in a reduced pressure state by the ejector 21, saturation temperature of the steam is low and the materials can be caused to react at a low temperature below 100C. In the case of turning from heating to cooling, the valve 19 is closed and the valve 45 is opened by a signal from the central control unit 51, and cool water is supplied into the tank 25, thereby lowering the water temperature within the tank 25 gradually. Thus, the reaction vessel 1 is cooled with water whose temperature lowers gradually.
The water temperature within the tank 25 is sensed by the temperature sensor 31 and the central control unit 51 responds thereto to control the valve 35, thereby controlling a change of the water temperature in accordance with a predetermined program to control a temperature change of the heat exchanger 11. The level sensors 29a and 29b sense the upper and lower limit of the water level, respectively, and the central control unit 51 responds thereto to control the valves 35 and 49 for maintaining the water level of the tank 25 substantially constant.
In this prior art device, the temperature difference between the initial cooling water and the heating steam is small at the time of turning from heating to cooling and, therefore, it has the advantage that there is no hammering effect caused by thermal shock and the lifetime of the device can be extended.
However, this device has the disadvantage that, al-though the reduced pressure level within the heat exchanger 11 must be precisely controlled for effecting a predetermined temperature control of the heat exchanger 11, water having condensed from the steam within the heat exchanger 11 at the time of heating or remaining therein from evaporation at the time of cooling may pool in the vicinity of the outlet 15 to clog it up, thereby causing variations in the reduced pressure level and, accordingly, in the temperature, which results in variations in the quality of the reaction product. Moreover, it also has the problem that the water pooling in the vicinity of the outlet 15 actually makes it impossible to lower the heating temperature below 50C since it impedes pressure reduction within the heat exchanqer 11. While it is considered to branch the piping 24 and connect it to the upper portion of the heat exchanger 11 for promoting reduction of the pressure, it exhibits no actual pres-sure reducing effect since the condensed water is sucked pre-ferentially. On the other hand, to control supply of the steam and water so as to prevent the water from pooling is undesirable since it needs a very complicated and expensive control device.
Accordingly, an object of this invention is to pro-vide an improved device which can effect an effective heat treatment at a much lower temperature regardless of the above-mentioned water pooling, by adding a simple improvement to the above-mentioned prior art device.
Summary of Invention According to this invention, the above-mentioned object can be attained by connecting another sucking means to the upper portion of the heat exchanger of the prior art device to suck the remaining vapor in the upper portion of the heat exchanger aside from the ejector connected to the lower outlet of the heat exchanger.
According to a broad aspect of the invention there is provided a reduced pressure heat treating device comprising a heat exchanger having an inlet and an outlet for heat medium at upper and lower portions thereof, respectively, for effecting heat exchange with product to be subjected to heat treatment, vapor producing means connected to said inlet for feeding vapor of said heat medium to said heat exchanger, first sucking means connected to said outlet for sucking said heat medium to put the interior of said heat exchanger in a reduced pressure state, a storage tank connected to said first sucking means for storing said heat medium, and pump means for feeding said heat medium from said storage tank to the inlet of said heat exchanger; character-ized in that said device further includes second sucking means connected to the upper portion of said heat exchanger for sucking vapor of said heat medium produced in said heat exchanger to remove the same therefrom for promoting pressure reduction in said heat exchanger.
The above and other objects and features of this invention will be described in more detail below with reference to the accompanying drawings.
Throughout the drawings, the same reference numerals are given to corresponding structural components and no descrip-tion will be repeated thereon.
Description of Preferred Embodiments As is understood from Figure 2 which shows an embodiment of this invention, this embodiment is constructed by adding some components to the prior art device of ~igure 1. Since th~ same components as shown in Figure 1 indeed effect substan-tially the same functions as described above, the following description will not relate to these components but only to the additional components.
More particularly, a steam trap 53 and an automatic valve 55 are inserted in parallel in piping 24 between a heat exchanger 11 and an ejector 21 and, as a feature of this inven-tion, an evacuation pump 57 is connected through piping 59 and an automatic valve 61 to a top portion of the heat exchanger 11.
An inlet 13 of the heat exchanger 11 is further connected through an automatic valve 63 and piping 65 to a cooling water supply piping 33. The inlet 13 opens throughout the periphery of the side wall of a reaction vessel 1 so that heat media such as steam and water are distributed uniformly throughout the periphery of its side wall. In addition, the reaction vessel l is provided with a temperature sensor 67 whose temperature signal is transferred to a central control unit 51.
The operation of this embodiment is substantially the same as that of the prior art device of Figure 1 if the valve 55 is opened and the valves 61 and 63 are closed. In this embodiment, however, the evacuation pump 57 is driven and the valve 61 is opened appropriately by a command from the control unit 51. Thus, such gases as steam and air within the heat exchanger 11 are discharged throu~h the piping 59 and cooling 206~7 _ 65259-141 water and condensed water are sucked by the ejector 21 to return to a water tank 25 as usual. Namely, the liquids and the gases are discharged through separate paths and, therefore, there is not the problem of the prior art device at all.
Accordingly, a sufficient reduced pressure state is obtained in the heat exchanger 11 and it is possible to effect treatment at low temperature such as below 50C. In this case, it is possible to open the valve 63 to supply cooling water of normal temperature directly into the heat exchanger 11 since no hammering effect is caused by the cooling water.
When the condensed water is not produced so much in a heating process using steam only, the valve 55 is closed to actuate the steam trap 53. Then, the condensed water is removed here and does not clog up the outlet 15 of the heat exchanger 11 and, therefore, the evacuation pump 57 is no longer needed.
While it is possible to use any suitable type of evacuation pump 57, Figure 3 shows a variation in which an ejector 73 is used therefor. Since the gas within the heat exchanger 11 is mainly water vapor which may condense in the way of discharge, the ejector is preferable as the evacuation pump 57.
The ejector 73 has its nozzle connected through an automatic valve 69 and piping 71 to the steam supply piping 17 so as to be driven with steam. Also, it has a diffuser opening to the external air.
Figure 4 shows another variation in which two ejectors 74 and 75 are further connected in series to the ejector 20~55Q7 65259-141 73 of Figure 3 in order to improve its evacuating power. The second ejector 74 has its nozzle connected through an automatic valve 77 to the piping 71 so as to be driven with steam, while the third ejector 75 has its nozzle connected through an auto-matic valve 79 to the cooling water piping 33 so as to be driven with water flow. The diffusers of the first and second ejectors are connected respectively to the suction chambers of the succeeding ejectors and the diffuser of the third ejector is opened to the external air.
In Figure 5 which shows a further variation, two series ejectors 73 and 74 are used and the diffuser of the second ejector 74 is connected to the suction chamber of the liquid sucking ejector 21 together with the piping 24 from the outlet of the heat exchanger 11, to recover condensation. Such recovery of condensation is often important when the heat medium is a substance other than water.
In the variation of Figure 6, the nozzle of the ejector 73 of Figure 3 is connected to the outlet of the pump 39, thereby driving the ejector 73 with output fluid of the pump 39.
The diffuser of the ejector 73 is connected to the tank 25 for recovering the driving fluid.
In the variation of Figure 7, the gas exhaust piping 59 is connected to the suction chamber of the ejector 21, so that the ejector 21 serves two functions at the same time. In this case, the ejector 21 has its nozzle connected through piping 81 having an automatic valve 83 to the steam supply piping 17 to be driven with high pressure steam, in order to raise its sucking power. A steam trap 85 is inserted in the piping 81 so as to remove condensed water.
The variation of Figure 8 shows an improvement of the heat exchanger 11. The inlet 13 of the heat exchanger 11 is provided with many nozzles 87 facing the side wall of the reaction vessel 1, so that cooling water is jetted against the side wall and caused to flow down uniformly along it to cool the vessel 1 efficiently. A nozzle 89 is also disposed in the lower portion of the heat exchanger 11 and connected to a compressed air supply (not shown) through piping 91 having an automatic valve 93. The nozzle 89 serves to cause the air jetted therefrom to flow helically upwards within the heat exchanger 11 and be exhausted by the evacuation pump 57. With this structure, the temperature in the heat exchanger 11 is made uniform and any irregular cooling can be prevented.
The above description is given only for the purpose of illustration and does not mean any limitation to the inven-tion. Various modifications and chan~es can be made to the above embodiments without departing from the spirit and scope of the invention as defined in the appended claims. For example, the heat exchanger 11 is not limited to the jacket type as shown and may be of any type suitable for applying the invention. While ejectors are used as a preferred embodiment of the suction pump means for discharging liquids and gases, any type having a suit-able sucking power may be used therefor. Although water and 2 0 65S ~ 7 65259-141 its vapor are used as the heat media, other known materials may be used in accordance with the treating conditions. Moreover, some of the automatic valves as shown may be manually operated, or appropriately omitted.
Brief Description of the Drawings In the drawings:
Figure 1 is a schematic view showing a configuration of a reduced pressure heat treating device according to the prior art;
Figure 2 is a schematic view showing a configuration of an embodiment of the reduced pressure heat treating device according to this invention;
Figures 3, 4, 5 and 6 are partial views showing variations of the embodiment of Figure 2, respectively; and Figures 7 and 8 are partial views showing further variations of the embodiment of Figure 2.
In the chemical industry and food industry, mater-ials may be treated at relatively low temperature such as about 50C, for example, for the purpose of safety of working and maintenance of product quality. Such a reduced pressure steam heat treating device as disclosed in the Japanese opened patent gazette No. Hl-315336 has been proposed for this heat treatment.
As shown in. Fi~ure 1, this device includes a reaction vessel 1 for causing materials supplied from an inlet 5 to react while stirring them by a stirrer 7 and delivering reaction product from - 2 0 6 5 ~ 0 7 65259-l4l an outlet 9. A heat exchanger 11 of jacket type having an inlet 13 and an outlet 15 of a heat media such as steam and water surrounds the vessel 1. Piping 17 feeds heating steam to the heat exchanger 11 through an automatic valve 19, a suction pump 21 of ejector type having its suction port 23 connected to the outlet 15 of the heat exchanger 11 through piping 24. A water tank 25 has a diffuser 27 of the ejector 21 connected to its upper space and is provided with level sensors 29a and 29b and a temperature sensor 31. Piping 33 feeds cooling water to the water tank 25 through an automatic valve 35, and piping 37 connects a lower portion of the tank 25 to a jetting nozzle 41 of the ejector 21 through a pump 39. Piping 43 connects the piping 37 to the inlet 13 of the h~at exchanger 11 through an automatic valve 45, and drain piping 47 connects the piping 43 to the exterior through an automatic valve 49. A central control unit 51 receives signals from the sensors 29a and 29b and 31 to control the respective automatic valves. When the pump 39 is driven, the water in the tank 25 circulates through the piping 37 and the ejector 21 to maintain the ejector 21 in a sucking state.
When the reaction vessel 1 is heated, the valve 19 is opened and the valve 45 is closed by signals from the central control unit 51, and heating steam is supplied from the piping 17 to the heat exchanger 11. The steam is sucked by the ejector 21 to enter the water tank 25 together with condensed water, thereby raising the water temperature within the tank 25 gradual-ly. Since the interior of the heat exchanger 11 is put in a reduced pressure state by the ejector 21, saturation temperature of the steam is low and the materials can be caused to react at a low temperature below 100C. In the case of turning from heating to cooling, the valve 19 is closed and the valve 45 is opened by a signal from the central control unit 51, and cool water is supplied into the tank 25, thereby lowering the water temperature within the tank 25 gradually. Thus, the reaction vessel 1 is cooled with water whose temperature lowers gradually.
The water temperature within the tank 25 is sensed by the temperature sensor 31 and the central control unit 51 responds thereto to control the valve 35, thereby controlling a change of the water temperature in accordance with a predetermined program to control a temperature change of the heat exchanger 11. The level sensors 29a and 29b sense the upper and lower limit of the water level, respectively, and the central control unit 51 responds thereto to control the valves 35 and 49 for maintaining the water level of the tank 25 substantially constant.
In this prior art device, the temperature difference between the initial cooling water and the heating steam is small at the time of turning from heating to cooling and, therefore, it has the advantage that there is no hammering effect caused by thermal shock and the lifetime of the device can be extended.
However, this device has the disadvantage that, al-though the reduced pressure level within the heat exchanger 11 must be precisely controlled for effecting a predetermined temperature control of the heat exchanger 11, water having condensed from the steam within the heat exchanger 11 at the time of heating or remaining therein from evaporation at the time of cooling may pool in the vicinity of the outlet 15 to clog it up, thereby causing variations in the reduced pressure level and, accordingly, in the temperature, which results in variations in the quality of the reaction product. Moreover, it also has the problem that the water pooling in the vicinity of the outlet 15 actually makes it impossible to lower the heating temperature below 50C since it impedes pressure reduction within the heat exchanqer 11. While it is considered to branch the piping 24 and connect it to the upper portion of the heat exchanger 11 for promoting reduction of the pressure, it exhibits no actual pres-sure reducing effect since the condensed water is sucked pre-ferentially. On the other hand, to control supply of the steam and water so as to prevent the water from pooling is undesirable since it needs a very complicated and expensive control device.
Accordingly, an object of this invention is to pro-vide an improved device which can effect an effective heat treatment at a much lower temperature regardless of the above-mentioned water pooling, by adding a simple improvement to the above-mentioned prior art device.
Summary of Invention According to this invention, the above-mentioned object can be attained by connecting another sucking means to the upper portion of the heat exchanger of the prior art device to suck the remaining vapor in the upper portion of the heat exchanger aside from the ejector connected to the lower outlet of the heat exchanger.
According to a broad aspect of the invention there is provided a reduced pressure heat treating device comprising a heat exchanger having an inlet and an outlet for heat medium at upper and lower portions thereof, respectively, for effecting heat exchange with product to be subjected to heat treatment, vapor producing means connected to said inlet for feeding vapor of said heat medium to said heat exchanger, first sucking means connected to said outlet for sucking said heat medium to put the interior of said heat exchanger in a reduced pressure state, a storage tank connected to said first sucking means for storing said heat medium, and pump means for feeding said heat medium from said storage tank to the inlet of said heat exchanger; character-ized in that said device further includes second sucking means connected to the upper portion of said heat exchanger for sucking vapor of said heat medium produced in said heat exchanger to remove the same therefrom for promoting pressure reduction in said heat exchanger.
The above and other objects and features of this invention will be described in more detail below with reference to the accompanying drawings.
Throughout the drawings, the same reference numerals are given to corresponding structural components and no descrip-tion will be repeated thereon.
Description of Preferred Embodiments As is understood from Figure 2 which shows an embodiment of this invention, this embodiment is constructed by adding some components to the prior art device of ~igure 1. Since th~ same components as shown in Figure 1 indeed effect substan-tially the same functions as described above, the following description will not relate to these components but only to the additional components.
More particularly, a steam trap 53 and an automatic valve 55 are inserted in parallel in piping 24 between a heat exchanger 11 and an ejector 21 and, as a feature of this inven-tion, an evacuation pump 57 is connected through piping 59 and an automatic valve 61 to a top portion of the heat exchanger 11.
An inlet 13 of the heat exchanger 11 is further connected through an automatic valve 63 and piping 65 to a cooling water supply piping 33. The inlet 13 opens throughout the periphery of the side wall of a reaction vessel 1 so that heat media such as steam and water are distributed uniformly throughout the periphery of its side wall. In addition, the reaction vessel l is provided with a temperature sensor 67 whose temperature signal is transferred to a central control unit 51.
The operation of this embodiment is substantially the same as that of the prior art device of Figure 1 if the valve 55 is opened and the valves 61 and 63 are closed. In this embodiment, however, the evacuation pump 57 is driven and the valve 61 is opened appropriately by a command from the control unit 51. Thus, such gases as steam and air within the heat exchanger 11 are discharged throu~h the piping 59 and cooling 206~7 _ 65259-141 water and condensed water are sucked by the ejector 21 to return to a water tank 25 as usual. Namely, the liquids and the gases are discharged through separate paths and, therefore, there is not the problem of the prior art device at all.
Accordingly, a sufficient reduced pressure state is obtained in the heat exchanger 11 and it is possible to effect treatment at low temperature such as below 50C. In this case, it is possible to open the valve 63 to supply cooling water of normal temperature directly into the heat exchanger 11 since no hammering effect is caused by the cooling water.
When the condensed water is not produced so much in a heating process using steam only, the valve 55 is closed to actuate the steam trap 53. Then, the condensed water is removed here and does not clog up the outlet 15 of the heat exchanger 11 and, therefore, the evacuation pump 57 is no longer needed.
While it is possible to use any suitable type of evacuation pump 57, Figure 3 shows a variation in which an ejector 73 is used therefor. Since the gas within the heat exchanger 11 is mainly water vapor which may condense in the way of discharge, the ejector is preferable as the evacuation pump 57.
The ejector 73 has its nozzle connected through an automatic valve 69 and piping 71 to the steam supply piping 17 so as to be driven with steam. Also, it has a diffuser opening to the external air.
Figure 4 shows another variation in which two ejectors 74 and 75 are further connected in series to the ejector 20~55Q7 65259-141 73 of Figure 3 in order to improve its evacuating power. The second ejector 74 has its nozzle connected through an automatic valve 77 to the piping 71 so as to be driven with steam, while the third ejector 75 has its nozzle connected through an auto-matic valve 79 to the cooling water piping 33 so as to be driven with water flow. The diffusers of the first and second ejectors are connected respectively to the suction chambers of the succeeding ejectors and the diffuser of the third ejector is opened to the external air.
In Figure 5 which shows a further variation, two series ejectors 73 and 74 are used and the diffuser of the second ejector 74 is connected to the suction chamber of the liquid sucking ejector 21 together with the piping 24 from the outlet of the heat exchanger 11, to recover condensation. Such recovery of condensation is often important when the heat medium is a substance other than water.
In the variation of Figure 6, the nozzle of the ejector 73 of Figure 3 is connected to the outlet of the pump 39, thereby driving the ejector 73 with output fluid of the pump 39.
The diffuser of the ejector 73 is connected to the tank 25 for recovering the driving fluid.
In the variation of Figure 7, the gas exhaust piping 59 is connected to the suction chamber of the ejector 21, so that the ejector 21 serves two functions at the same time. In this case, the ejector 21 has its nozzle connected through piping 81 having an automatic valve 83 to the steam supply piping 17 to be driven with high pressure steam, in order to raise its sucking power. A steam trap 85 is inserted in the piping 81 so as to remove condensed water.
The variation of Figure 8 shows an improvement of the heat exchanger 11. The inlet 13 of the heat exchanger 11 is provided with many nozzles 87 facing the side wall of the reaction vessel 1, so that cooling water is jetted against the side wall and caused to flow down uniformly along it to cool the vessel 1 efficiently. A nozzle 89 is also disposed in the lower portion of the heat exchanger 11 and connected to a compressed air supply (not shown) through piping 91 having an automatic valve 93. The nozzle 89 serves to cause the air jetted therefrom to flow helically upwards within the heat exchanger 11 and be exhausted by the evacuation pump 57. With this structure, the temperature in the heat exchanger 11 is made uniform and any irregular cooling can be prevented.
The above description is given only for the purpose of illustration and does not mean any limitation to the inven-tion. Various modifications and chan~es can be made to the above embodiments without departing from the spirit and scope of the invention as defined in the appended claims. For example, the heat exchanger 11 is not limited to the jacket type as shown and may be of any type suitable for applying the invention. While ejectors are used as a preferred embodiment of the suction pump means for discharging liquids and gases, any type having a suit-able sucking power may be used therefor. Although water and 2 0 65S ~ 7 65259-141 its vapor are used as the heat media, other known materials may be used in accordance with the treating conditions. Moreover, some of the automatic valves as shown may be manually operated, or appropriately omitted.
Claims (7)
1. A reduced pressure heat treating device comprising a heat exchanger having an inlet and an outlet for heat medium at upper and lower portions thereof, respectively, for effecting heat exchange with product to be subjected to heat treatment, vapor producing means connected to said inlet for feeding vapor of said heat medium to said heat exchanger, first sucking means connected to said oultet for sucking said heat medium to put the interior of said heat exchanger in a reduced pressure state, a storage tank connected to said first sucking means for storing said heat medium, and pump means for feeding said heat medium from said storage tank to the inlet of said heat exchanger;
characterized in that said device further includes second sucking means connected to the upper portion of said heat exchanger for sucking vapor of said heat medium produced in said heat exchanger to remove the same therefrom for promoting pressure reduction in said heat exchanger.
characterized in that said device further includes second sucking means connected to the upper portion of said heat exchanger for sucking vapor of said heat medium produced in said heat exchanger to remove the same therefrom for promoting pressure reduction in said heat exchanger.
2. A reduced pressure heat treating device as set forth in claim 1, characterized in that said second sucking means includes at least one ejector.
3. A reduced pressure heat treating device as set forth in claim 2, characterized in that said ejector is driven with the vapor from said vapor producing means.
4. A reduced pressure heat treating device as set forth in claim 2, characterized in that said ejector is driven with output fluid of said pump means.
5. A reduced pressure heat treating device as set forth in claim 2, characterized in that said ejector has an outlet connected to said storage tank.
6. A reduced pressure heat treating device as set forth in claim 1, characterized in that said first and second sucking means include a common ejector driven with the vapor from said vapor producing means.
7. A reduced pressure heat treating device as set forth in claim 1, characterized in that said heat exchanger includes a plurality of nozzles and compressed air feeding means for agitating the heat medium in said heat exchanger.
Applications Claiming Priority (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11088091 | 1991-04-15 | ||
| JPH3-110880 | 1991-04-15 | ||
| JPH3-140928 | 1991-05-15 | ||
| JP3140928A JP2764226B2 (en) | 1991-05-15 | 1991-05-15 | Decompression evaporative cooling equipment |
| JP20128391A JP2681318B2 (en) | 1991-07-15 | 1991-07-15 | Decompression evaporative cooling equipment |
| JPH3-201284 | 1991-07-15 | ||
| JP20128491A JP2724776B2 (en) | 1991-07-15 | 1991-07-15 | Heating and cooling device |
| JPH3-201283 | 1991-07-15 | ||
| JPH3-262832 | 1991-09-13 | ||
| JP3262832A JP2729421B2 (en) | 1991-04-15 | 1991-09-13 | Decompression evaporative cooling equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2065507A1 CA2065507A1 (en) | 1992-10-16 |
| CA2065507C true CA2065507C (en) | 1994-10-18 |
Family
ID=27526462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002065507A Expired - Lifetime CA2065507C (en) | 1991-04-15 | 1992-04-07 | Reduced pressure heat treating device |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US5209284A (en) |
| EP (1) | EP0509646B1 (en) |
| CN (1) | CN1034633C (en) |
| AU (1) | AU635457B2 (en) |
| BR (1) | BR9201370A (en) |
| CA (1) | CA2065507C (en) |
| DE (1) | DE69200056T2 (en) |
| DK (1) | DK0509646T3 (en) |
| ES (1) | ES2052404T3 (en) |
| NO (1) | NO301188B1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5466603A (en) * | 1994-02-15 | 1995-11-14 | Meehan; Brian W. | Temperature regulated hybridization chamber |
| US6739288B1 (en) * | 2000-01-14 | 2004-05-25 | Tvl Co., Ltd. | Steam heating device |
| US20030224303A1 (en) * | 2002-05-07 | 2003-12-04 | Fuji Photo Film Co., Ltd. | Solid dispersion, process of producing solid dispersion, and heat developable photosensitive material |
| US6983723B2 (en) * | 2004-06-10 | 2006-01-10 | Brewster Jackie L | Method and apparatus for providing on-demand hot water |
| FR2879608B1 (en) * | 2004-12-22 | 2007-03-16 | Solvay | PROCESS FOR DRYING A WET POLYMER |
| US20080025889A1 (en) * | 2006-03-27 | 2008-01-31 | Dwayne Brent Cole | Steam-hose with steam-trap |
| CN101654265B (en) * | 2008-08-19 | 2011-06-29 | 沈阳铝镁设计研究院有限公司 | Diluting tank waste-heat recovering device and control system and control method thereof |
| KR100898380B1 (en) * | 2008-11-13 | 2009-05-18 | 영일펌프테크(주) | Apparatus for recovering vent steam and drain |
| DE102010014992A1 (en) | 2010-04-14 | 2011-10-20 | Uhde Gmbh | Method for heating or keeping warm the flow paths of a process plant |
| JP5917225B2 (en) * | 2012-03-28 | 2016-05-11 | 株式会社テイエルブイ | Low pressure steam heating device |
| US8978399B2 (en) * | 2013-01-14 | 2015-03-17 | Serguei A. Popov | Heat pumping unit and variants thereof |
| CN105435712A (en) * | 2014-09-30 | 2016-03-30 | 李肥生 | Low-temperature high-pressure gas explosion device |
| US10145269B2 (en) | 2015-03-04 | 2018-12-04 | General Electric Company | System and method for cooling discharge flow |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2525581A (en) * | 1947-07-08 | 1950-10-10 | Ingersoll Rand Co | Apparatus for treating food material |
| JPS4949232B1 (en) * | 1968-12-29 | 1974-12-26 | ||
| JPS57202490A (en) * | 1981-06-08 | 1982-12-11 | Toshiba Corp | Gas extracting equipment |
| JPS58173390A (en) * | 1982-04-02 | 1983-10-12 | Babcock Hitachi Kk | Purging device of noncondensable gas in heat pipe |
| SU1205886A1 (en) * | 1984-02-03 | 1986-01-23 | Свердловский институт народного хозяйства | Digester |
| AU601118B1 (en) * | 1989-11-14 | 1990-08-30 | Tlv Co., Ltd. | Reduced pressure steam heat treating device |
-
1992
- 1992-03-05 AU AU11427/92A patent/AU635457B2/en not_active Expired
- 1992-03-09 US US07/848,286 patent/US5209284A/en not_active Expired - Lifetime
- 1992-03-19 ES ES92302380T patent/ES2052404T3/en not_active Expired - Lifetime
- 1992-03-19 DK DK92302380.8T patent/DK0509646T3/en active
- 1992-03-19 DE DE69200056T patent/DE69200056T2/en not_active Expired - Lifetime
- 1992-03-19 EP EP92302380A patent/EP0509646B1/en not_active Expired - Lifetime
- 1992-04-02 CN CN92102343A patent/CN1034633C/en not_active Expired - Lifetime
- 1992-04-07 CA CA002065507A patent/CA2065507C/en not_active Expired - Lifetime
- 1992-04-13 NO NO921469A patent/NO301188B1/en not_active IP Right Cessation
- 1992-04-14 BR BR929201370A patent/BR9201370A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| NO921469L (en) | 1992-10-16 |
| US5209284A (en) | 1993-05-11 |
| CA2065507A1 (en) | 1992-10-16 |
| EP0509646A1 (en) | 1992-10-21 |
| ES2052404T3 (en) | 1994-07-01 |
| DE69200056D1 (en) | 1994-04-07 |
| BR9201370A (en) | 1992-12-01 |
| AU635457B2 (en) | 1993-03-18 |
| NO301188B1 (en) | 1997-09-22 |
| CN1065812A (en) | 1992-11-04 |
| AU1142792A (en) | 1992-10-22 |
| CN1034633C (en) | 1997-04-23 |
| EP0509646B1 (en) | 1994-03-02 |
| DK0509646T3 (en) | 1994-03-28 |
| DE69200056T2 (en) | 1994-09-08 |
| NO921469D0 (en) | 1992-04-13 |
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